The language barrier really isn't that much of a problem. The only thing that's really awesome is that Twi'Leks talk in leku also! So you can talk smack about someone and they won't know what you are saying!

If someone speaks a language you don't know, it'll show up as jarble. When a wookie speaks Shyriiwook it'll show up as jarble (until you learn it), for example, "rarrrr wwwooook rarrrr" Chewie says in Shyriiwook. WHen you know it, it'll say, "Hey, I'm chewie," Chewie Says in Shyriiwook.